Chair backrest



FIG. 1 is a perspective view of a chair backrest according to the present invention;

FIG. 2 is a front view of a chair backrest according to the present invention;

FIG. 3 is a rear view of a chair backrest according to the present invention;

FIG. 4 is a profile view of a chair backrest according to the present invention;

FIG. 5 is a second profile view of a chair backrest according to the present invention;

FIG. 6 is a top view of a chair backrest according to the present invention; and,

FIG. 7 is a bottom view of a chair backrest according to the present invention. 

CLAIM The ornamental design for a chair backrest, as shown and described. 